If four-fifths of the marks scored by Ambuj in Maths is equal to four-thirds of the marks scored by him in Physics, and if the sum of marks scored by him in both the subjects is 120, how many marks did he score in physics ?

A train runs for five hours at a speed of 40 kmh-1 and for the next 20 hours at a speed of 30 kmh- 1 , covering 2/3 of the total distance. If the remaining distance is to be covered in 8 hours, what should be speed of the train ?